Abstract
Graphite oxide (GO) is layered structure with functional groups such as hydroxyl, carboxyl and carbonyl between layers. Using GO as cathode active material allows lithium ions to enter the interior of cathode active material easily and the transformation of crystal form can also be obviated. GO has large amounts of surface area which enables cathode material to contact with liquid electrolyte directly, thereby direct and fast surface adsorption and reaction with lithium ions can be achieved. In this article, GO was prepared by modified Hummers method, characterized by XRD, IR, TG, and its electrochemical performance is studied as cathode active material. It is discovered that capacity can be dramatically improved and the cycle performance is excellent when GO is used as cathode material. The discharge capacity of first cycle can reach 480mAh/g at the current density 0.1A/g. The capacity is above 90% after 10 cycles.
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